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		<title>英文大小写转换</title>
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		<p>原文：html5njknfrnfjkrnfuri</p>
		<p class="p1">原文：首字母大写html5njknfrnfjkrnfuri</p>
		<p class="p2">原文：小写html5njknfrnfjkrnfuri</p>
	    <p class="p3">原文：大写html5njknfrnfjkrnfuri</p>
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